Medellín's urban forest miracle

Medellín transforms its urban landscape with green corridors, showing the world how to beat urban heat.

Peter Yeung reports for Reasons to be Cheerful.


In short:

  • Medellín's Green Corridors project has significantly lowered the city's temperature by planting trees and creating green spaces.
  • This initiative has not only cooled the city by 2°C in three years but also improved air quality and increased biodiversity.
  • The effort was led by the community, with support from city officials, and is seen as a model for other cities facing the heat island effect.

Key quote:

“Medellín grew at the expense of green spaces and vegetation. We built and built and built. There wasn’t a lot of thought about the impact on the climate. It became obvious that had to change."

— Pilar Vargas, a forest engineer working for City Hall

Why this matters:

Medellín's success in cooling its urban environment demonstrates a sustainable way to tackle the urban heat island effect, improving living conditions and health outcomes. As cities worldwide grapple with rising temperatures, this Colombian city's approach offers a blueprint for urban resilience and environmental stewardship.

Be sure to read about Tucson's ambitious tree planting goal aims to improve the health of residents, wildlife, and the watershed.

white smoke coming out from power plant on a green hill.

World still on track for catastrophic 2.6C temperature rise, report finds

Fossil fuel emissions have hit a record high while many nations have done too little to avert deadly global heating.

a herd of cattle standing next to each other

At COP30, Brazilian meat giant JBS recommends climate policy

Meat giant JBS is steering a private-sector “food systems” push to shape climate policy at COP30, promoting productivity-focused recommendations.

Technician wearing white gloves testing solar panel with multimeter
Credit: toa55/BigStock Photo ID: 397172075

Zanzibar’s ‘solar mamas’ technicians help light up communities

Around half of Zanzibar’s population of 2 million people live unconnected from the electricity grid.
Long row of rolls of aluminum in production shop of plant.
Credit: Paha_L/BigStock Photo ID: 45109327

Can Australia power its big aluminum smelters with clean energy?

The country is launching subsidies for smelters that use wind and solar power to produce the metal. It’s part of early global efforts to decarbonize heavy industry.

Protesters face of with police on city street
Credit: Photo by Steve Daniel on Unsplash

The deepening ties between Canadian Security Intelligence Service and resource companies

As the federal government earmarks resource extraction projects in the ‘national interest,’ the companies building them are deepening ties to CSIS.

Ship and tugs are maneuvering at an LNG terminal
Credit: photowrzesien/BigStock Photo ID: 412271062

Claims secret gas decarbonization report 'doctored' by Western Australia government to support net zero narrative

Last year the WA government commissioned a report on whether LNG exports to Asia were helping decarbonization efforts — but the final report is vastly different to the draft, and analysts and activists say it has been doctored.

Interior of a data center with rows of servers
Credit: Getty Images/Unsplash+

Data centers’ use of diesel generators for backup power is commonplace — and problematic

Energy analysts and environmentalists say diesel generators are expensive, noisy, highly polluting and exempt from Clean Air Act regulations in times of energy “emergencies.”
From our Newsroom
Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

Multiple Houston-area oil and gas facilities that have violated pollution laws are seeking permit renewals

One facility has emitted cancer-causing chemicals into waterways at levels up to 520% higher than legal limits.

Regulators are underestimating health impacts from air pollution: Study

Regulators are underestimating health impacts from air pollution: Study

"The reality is, we are not exposed to one chemical at a time.”

Pennsylvania governor Josh Shapiro speaks with the state flag and American flag behind him.

Two years into his term, has Gov. Shapiro kept his promises to regulate Pennsylvania’s fracking industry?

A new report assesses the administration’s progress and makes new recommendations

silhouette of people holding hands by a lake at sunset

An open letter from EPA staff to the American public

“We cannot stand by and allow this to happen. We need to hold this administration accountable.”

wildfire retardants being sprayed by plane

New evidence links heavy metal pollution with wildfire retardants

“The chemical black box” that blankets wildfire-impacted areas is increasingly under scrutiny.

Stay informed: sign up for The Daily Climate newsletter
Top news on climate impacts, solutions, politics, drivers. Delivered to your inbox week days.